Magnet and dynamo-electric-machine structure



June 5, 1923. 1,458,120

R. B. WILLIAMSON MAGNET AND DYNAMO ELECTRIC MACHINE STRUCTURE Filed June 8, 1918 UHIHIII llllHlllllI Patented June 5, 1923.

UNITED STATES PATENT OFFICE.

ROBERT B. WILLIAMSON, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO ALLIS- CHALMERS MANUFACTURING COMPANY, OF MILVIAUKEE, WISCONSIN, A

CORPORATION OF DELAWARE.

MAGNET AND DYNAMO-ELECTBIC-MACHINE STRUCTURE.

Application filed June 8,

To all whom it may concern:

Be it known that ROBERT B. lVILLIAMscN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, has invented a certain new and useful Improvement in Magnet and Dynamo-Electric-Machine Structures of which the following is a specification.

. This invention relates to magnets and the method of constructing the same. The invention may be applied in dynamo-electric machines in the construction of the stator, for example, and in particular in large alternating current generators.

A general object of the invention is the provision of a less expensive method of building magnet structures.

Another object is the provision of an article of manufacture making possible the carrying out of the method.

Another object is the provision of a magnet structure requiring less iron than prior structures. I

Another object is the provision of efficient means for ventilating the magnet and any parts that may be associated therewith such as the armature of a dynamo-electric machine, or the revolving field magnet, as the case may be. Other objects will appear hereinafter as the description of the invention proceeds.

The novel features of the invention will appear from this specification and the accompanying drawings which form a part thereof and all these novel features are intended to be particularly pointed out in the claims.

In Fig. 1, which is a vertical partially sectional view more or less diagrammatic. the

invention is 'shown as it may be applied in an alternating current generator.

Fig. 2 isa perspective view of a skeleton frame forming part of the magnet structure.

Fig. 3 isa plan view of one section of the skeleton frame, adjoining sections being partly shown and broken away.

In Fig. 1 is shown a wheel pit 1 of a hydraulic turbine (not shown), the wheel pit having sides 2. The turbine has a shaft 3 5o guided by a spider 4. At the upper end of the shaftB is mounted a spider 5 carrying. in this. case, the revolving field. magnets 65.

1918. Serial No. 239,327.

The upper end of the shaft 3 is also guided by the bridge 7, the latter having mounted thereon the bearing 8 for the shaft. The ar- 5 mature conductors 9 are wound in any usual manner in slots in the laminae 10. The lamina: are supported in a skeleton frame 11, a portion of which is shown enlarged in Fig. 2 and in plan in Fig. 3. The skeleton frame has extensions 12 thereon as may be best seen in Figs. 2 and 3. These extensions are here shown provided with dovetail slots. These dove-tail slots serve the purpose of receiving complementary dovetail extensions on the laminae. but it is clear that the laminae may be supported in any other desirable specific manner. The laminae may be clamped together and to the extensions on the frame by suitable endplates 14 as indicated in Fig. 1.

The skeleton frame is embedded in the concrete extension 15 of the wheel pit. The

top of this extension forms the floor 16 of the station. ventilating tunnel 17 may be provided the extension of the wheel pit and communicating therewith may be passages 18 which register with holes 19 in the skeleton frame.

The core 20 of the revolving field structure may be provided with air passages 21 through which air is blown out by centrifugal force against the laminae of the stator and passes through air passages 22 between the laminae. From there the air finds its way into the passages 18 and from thence into the tunnel 17. Fan-means 23 may also be provided on the revolving field structure for producing a circulation of air and the body of air so circulated will serve more particularly to cool the end conductors of the armature winding 9. This air finds its way as indicated by the arrows in the space left between the extensions 12 on the skeleton frame and the concrete extension of the wheel pit and from thence to the passages 18 and the tunnel 17. H i

For convenience in handling and ship ping, the skeleton frame may be built in sections as indicated in Fig. 3 showing a section 24. These sections may be bolted or fastened together by any suitable means 25. The dove-tail slots 13 are preferably located on the circumference a circle. It may be stated that in Fig. 2 the three extensions 12 with t 1c d e-tail slots 13 are shown in substantially straight line as a matter of convenience in drawing the same.

A convenient method of building a magnet or generator structure such a. illustrated in the drawings may be to first build the lower portion of the wheel pit and then support the skeleton frame comprising the desired number of sections, with th laminae the proper air gap distance from the rcvolving; field structure, on a suitable false worlr. Wooden moulds will then be suitably placed and. cores "for forming the lower passages 18 will be located in registry with the holes 19 in the frame. Concrete will then be poured in a suitable manner over and around the cores and a une. The upper cores for the passages 18 may be then i aced and concrete poured around the structures. When the oncrete set the cores may be removed through the tunnels 17. It is apparent that great saving in metal will result through the use 0?? the present invention inasmuch as the heavy metal supporting structures for the stator are replaced by the cheaper concrete. Furthermore handling; and shipping of the parts is made easier and cheaper.

The term. concrete is used in the claims for the sake of convenience and brevity, but it is to be understood that the term covers any mass formed up of cohering material previously comprising separate particles.

It should be understood that it is not desired the invention claimed be limited to the exact details of construction as shown and described for obvious modifications will occur to a person skilled in the art.

It is claimed an d desired to secure by Let ters Patent:

1. In a dynamo-electric machine, a concrete supporting structure having air passages, the stator comprising a core and a supporting: frame therefor, said frame being substantially embedded in said concrete structure and having openings to coact with said air passages.

2. In a dynamo-electric machine a stator including' a core having air passages, a rotor for cooperating with said stator, a concrete structure, and means for supporting fd stator core embedded in said concrete structure, said concrete structure having an air tunnel formed therein with a'r passages communicat ng with the air passages in said core and in ans for producing}; a movement on air in said passages.

3. In a dynamo-electric machine, a stator including); a core having; air passages, a rotor for cooperating witi said stator, means for sustaining}: the rotor, a concrete structure for supportine said sustaining means, means i'or supporting, said stator core embedded in said concrete structure, said conea-e320 crete structure having an air tunnel formed therein with air passages communicating with the air IMIESQZQS in said core, and means for producing a movement of air in said passages.

a dynamo-elect;'c.i achine, a stator ,cluc h a core but a1" passages, a rotor tor coorerating; with said stator, means for sustainin ti,- the rotor, a concrete structure for sup ioitin gsaid sustaining means and forming; a floor, means tor supporting said stator core embedded in said concrete structure. said concrete structure having an air tunn torn'ied therein with air passe comn'uinicatinp; with the air passages in said core, and means for produc ng a movement of air in said passages.

. in dynamo-electric machine, a stator a core having; air passages, a rut. r sting with said stator, a concrete and mean ror supporting; said or core embedded said concrete strucconcrete structure having an air ioii'ued therein with air passe niunicating with the air passages in said o. ii. dynauiorlectric machine. comprising 1. concrete siu'iportinp; structure huviuyr air a core supported by said structure air pas ".sg'es cooperating: with the es in. tructure.

uo-elect"ic HM ucture liar hug a tor sir spa i u i ng :ial l y aunul 2H opening; prov with said. core and cinl cdded in a dvnamo--elect-ri machine, a con- 5 'QDOTiJlUEf structure haviup air pasa core having air passages coope rath the passages in said structure, and

ans embedded in said structure for suprting; said core.

9. In dynamo-electric machine, a con crete supportinc" structure havingair passages, a stator comprisu a portion em bedded. in sa d concrete x:trruture and havinc: s ith "wcture. stator spaced said structuv with the sa d passages and having a portion spaced in part from said structure, said passages coacting with said space. 1

13. In a dynamo-electric machine, a concrete supporting structure, astator comprising a core spaced from said structure at both ends and spaced a lesser distance therefrom between said ends, said structure having air passages coacting with said spaces.

14. In a dynamo-electric machine, a stator comprising a core, a supporting structure therefor having surfaces spaced from said core at both ends of said core and spaced a, lesser distance therefrom between said ends, said structure having air passages coacting with said spaces.

15. In a dynamo-electric machine, a concrete supporting structure having a generally cylindrical surface, an annular stator spaced in part from said surface, said structure having air passages coacting with said space.

16. In a dynamo-electric machine, a concrete supporting structure having a generally cylindrical surface, an annular stator comprising a core disposed with respect to said surface to leave an annular space at each end of said core between said core and said surface, said structure having air passages to coact with said spaces.

17. A dynamo-electric machine comprising a stator formed partly of concrete, said concrete having ventilating passages therein.

18. In a dynamo-electric machine, a stator including a core having air passages, a rotor for cooperating with said stator, means for sustaining the rotor, a concrete structure for supporting said sustaining means, means for supporting said stator core embedded in said concrete structure, said concrete structure having air passages coacting with the air passages in said core.

19. In a dynamo-electric machine, a stator including a core having air passages, a rotor for cooperating with said stator, means for sustaining the rotor, a concrete structure for supporting said sustaining means and forming a floor, means for supporting said stator core embedded in said concrete structure, said concrete structure having air passages formed therein coacting with the air passages in said core.

20. In combination, a dynamo-electric machine having a rotor and a stationary magnetic-fluX-c arrying member, a support for said member including a concrete structure, and means for sustaining said rotor including a bridge or arch supported di rectly by said concrete structure and disposed above said rotor.

21. In a dynamo-electric machine, a stator formed partly of a body of concrete, a rotor for cooperating with said stator, means for sustaining said rotor including means disposed above said. rotor and supported directly by said body of concrete.

22. In a dynamo-electric machine, a concrete wall forming an opening, a core disposed in said opening and spaced from said wall, said core and said wall having ventilating passages communicating with said space, and means connected with said core including means embedded in said wall.

In testimony whereof, the signature of the inventor is affixed hereto.

ROBERT B. WILLIAMSON. 

